precautionary

形容词 precautionary:

1. taken in advance to protect against possible danger or failure
   同义词：precautional

pre.cau.tion.ar.y

adj.（形容词）
Of, relating to, or constituting a precaution:
预制的：属于、关于或构成预防措施的：
例句：
taking precautionary measures; gave precautionary advice.
采取预防措施；给予预防的建议